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What is the third proportional of 9 and 45 ?

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What is the third proportional of 9 and 45 ?
1. 220
2. 225
3. 230
4. 221
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Correct Answer - Option 2 : 225

Calculation:

Let the third proportional be x

According to the question:

45 × 45 = 9 × x

⇒ x = (45 × 45)/9 = 225

∴ The third proportional is 225.

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